Another solution is to design your data model so that it's fully peer-to-peer , then you don't need a point of centralisation. Except for realtime communication

Another solution is to design your data model so that it's fully peer-to-peer , then you don't need a point of centralisation. Except for realtime communication/updates, but you have a lot more leeway. CRDTs are an obvious way to do this. Or maybe something like CouchDB's document model?